echo 28 > /sys/class/gpio/export;
echo 86 > /sys/class/gpio/export;
echo 87 > /sys/class/gpio/export;
echo 85 > /sys/class/gpio/export;

echo out > /sys/class/gpio/gpio28/direction;
echo out > /sys/class/gpio/gpio86/direction;
echo out > /sys/class/gpio/gpio87/direction;
echo out > /sys/class/gpio/gpio85/direction;

